In Need Of An Elevator!

I would like someone to build me a piston elevator. It needs to go up twenty floors, and be fast. I am a what you could call "pro" redstone engineer, but one thing I could never build was an elevator. If you can do it, please leave a reply!

Hey man! I am also what you might call an "expert" but however in my simgle player creative world i had many elevators that went up nearly 60 floors, but ever since 1.4 update to minecraft all my piston elevators stopped working and i kept getting stuck in them. Since than i havent tried any other designs but i dont think they work